SMA-HR, TREMOR,PRISM 40s and 120s

BLAST and SMA

Digitisers - record any sensorSo, you're happy with the sensors you've got, but you want an easy-to-use, affordable digital recorder.

The entry level 3+1 channel Gecko Compact offers full functionality at a budget price, with a splash resistantbody suited for installation inside shelters or vaults. The next step up is the beautifully designed waterproofGecko Rugged for outdoor monitoring applications, which introduces the option of an internal battery for allday monitoring. We can also supply an Ethernet+WiFi adaptor or USB cable to stream data to a PC.

Professional all-in-one earthquake sensorsLarger, higher sensitivity sensors are tightly integrated under the Rugged body for our Gecko "Pro" range oftriaxial seismographs and accelerographs. An optional internal battery provides hours of backup running time ifthe main external power source is becomes unavailable.

Gecko Tremor uses velocity sensors with a flat frequency response from 0.5 seconds to 1600Hz. By adjusting thesensing range, users are able to tune the Tremor for high sensitivity local earthquake and aftershock monitoring(e.g. 16mm/s clip level) or for low frequency blast & urban vibration monitoring using the full 254mm/s range.

The Gecko SMA-HR uses the latest technology low noise optical sensors for high resolution strong motionacceleration monitoring while maintaining a ±2g full scale range, ideal for structural engineering applications.

The Prism 40s and Prism 120s velocity sensors use compact, low power components to achieve high sensitivityin a robust, portable package. Two frequency range options are available: 40-seconds to 90Hz for regional scaleearthquake monitoring applications; or 120-seconds to 60Hz for monitoring earthquakes worldwide.

GECKO COMPACT GECKO RUGGED

Seismographs and Accelerographs

Portable all-in-one vibration sensorsAdd an internal triaxial geophone or accelerometer to the Rugged to create a simple, affordable digital sensor.The most affordable digital sensor model is the Gecko Blast with its triaxial set of 4.5Hz geophones that areperfectly suited to urban vibration or blast velocity monitoring. An extra channel allows input for an externalair pressure monitoring microphone or other sensor.

The Gecko SMA (strong motion accelerograph) uses a triaxial accelerometer block for monitoring large signallevels in noisy environments. It is available with full scale range options from ±2g to ±400g.

A central hole passing through the entire sensor allows for rapid single hole installation using the includedmounting kit. The Blast also includes spikes to replace the removable feet for quick installation in soil.

GECKO Seismographs & Accelerographs

Technical Specifications

Seismology Research Centre, a division of ESS Earth Sciences141 Palmer Street, Richmond, Victoria 3121 Australiasales@src.com.au www.src.com.au

Gecko (shorted input) self noise below NLNMfrom 1000 seconds to 2Hz @100sps (5Hz @40sps)PSD amplitude scaled to 750V/m/s velocity sensor

Digitiser & RecordingDigitiser Type 32-bit ADC, differential or single-endedData Channels 3+1, synchronously sampledFull-scale range 40Vpp (for ±10V differential output sensors); SMA-HR & Prism: 60 Vpp60VppGain settings 1, 2, 4, 8, 16, 32, 64 for SMA-HR & Prism; others add 128, 256, and 512Frequency response DC to 1600Hz (at max sample rate)Sample rates (per second) 50, 100, 200, 250, 400, 500, 800, 1000, 2000, 4000Noise and Dynamic RangeNoise level (shorted input) Less than 1 LSB RMS noise in a 24-bit system @50spsSensitivity (typical, counts per Volt) 406,000; SMA-HR & Prism: 280,000Dynamic range (RMS noise vs FS range) 138dB @ 100sps (144dB @50sps, 127dB @4000sps)TimingReference Data is time stamped every second from GPS receiverAccuracy RMS 30 nanosecondsControlsUser Interface In-built LCD with 4-line text display and 4-button inputFile recording Continuous (always on), Histogram (always on)Trigger & Alarm STA/LTA triggering, Level (High & Low) triggering (3D or 1D); System AlarmsPre- and Post-trigger data Unlimited - user configurable in reception softwareCalibration signal generator Variable amplitude/frequency step/sine signal generationMass Control Calibrate enable, Mass Lock and Unlock commandsData StorageFlash memory type SD card, SLC NAND recommendedIncluded storage 32GB, hot swappable. Pre-formatted cards optional (64GB, 128GB)Continuous recording capacity Ring buffer data storage >1 year (3 channels @100sps)File system FAT32, readable by Windows, macOS & LinuxData format 24-bit MiniSEED (with data-less station information files; station.xml export)PowerDC input voltage range 11.5 to 24V (no cost option to enable 7 to 30V range)Consumption (LCD backlight off) 0.9W (1.4W with LCD backlight on, 2 minute backlight timeout)Physical Compact RuggedHousing Aluminium extrusion CNC milled aluminiumDust and Water Ingression Protection IP65 IP67Operating Temperature (100% R/H) -15 to +60 °C -20 to +60 °CDimensions (without cables) 140 x 108 x 71mm Ø 136mm, 130mm highWeight 570g 1.9kg (incl. opt. battery)Data TelemetryConnectivity options (sold separately) Ethernet/WiFi adaptor, 4G cellular modem, GeckoLink co-processorTCP Socket Streaming Push to eqServer or Streams, pull from SeedLink (via GeckoLink)Remote setup and firmware upgrades Web interface (eqServer & GeckoLink) or application (Streams)Connectors & CablesExternal sensor connection Mil-spec socket 14-19P cable plug includedGPS connection Magnetic patch antenna with 5m cable (SMA coaxial bulkhead)Maximum GPS cable length 80 metres (with high gain aerial, sold separately)

Digital Sensors Blast +1ch SMA +1ch Tremor SMA-HR Prism 40 Prism 120Type Velocity Acceleration Velocity Acceleration Velocity VelocityFlat Response (-3dB) 4.5Hz to 1.6kHz DC to 1.6kHz 0.5s to 1.6kHz 250s to 800Hz 40s to 90Hz 120s to 60HzPower 0.95W 1.1W 1.0W 0.95W 1.0W 1.0WMaximum Clip Level ±695mm/s ±2g to ±400g ±254 mm/s ±2g ±40 mm/s ±86 mm/sOperating Temp °C -15 to +60 -20 to +60 -20 to +60 -20 to +60 -20 to +60 -20 to +60Height 145mm 145mm 185mm 185mm 185mm 185mmWeight 2.2kg 1.7kg 3.0kg 2.7kg 2.7kg 2.7kg